top of page

About Us

Founded by Mark L. Haynes in 2009, Commercial Estimating Services, LLC is based on many years of applied construction expertise and a network of reliable industry resources. 

Prior to creating an independent estimating and cost consulting service, Mark spent over 30 years with well-known general contracting firms in the St. Louis area, the majority of those years being with contractors on the ENR Top 400 list. Early in his career, he provided field support as an on-site project engineer and then quickly developed the skills necessary to be a lead estimator responsible for all phases and CSI Divisions of project estimates, including the project schedule and general requirements. Mark has also enjoyed being a mentor to beginning and developing estimators.

The vast majority of our experience is in the Missouri, Central Illinois & Southern Illinois markets, but we have the experience and know how to provide our services in many other areas of the Midwest as well. Our business has continued to grow and has proved to be a reliable source of effective cost management services.

Our company is based on the belief that our client's needs are what matters most. Commercial Estimating Services, LLC is committed to meeting those needs. As a result, a high percentage of our business is from repeat clients and referrals. We deliver value and confidence through effective communication with all team members.

I welcome the opportunity to earn your trust and deliver the most accurate, dependable and professional cost consulting services in the construction industry.


Mark L. Haynes, LEED® A.P.


Business Address:

111 Ashwood Ct.

Collinsville, IL 62234

Business Hours:

Mon - Fri: 8AM - 5PM (CDT)*

* Inquiries receive immediate attention and responses are made promptly. Please contact us by filling out the form on our Contact Us page. We can help you with all your estimating needs.

bottom of page